Brake shoe assembling and disassembling device



Dec. 18, 1945. M. H. WILLIAMS BRAKE SHOE ASSEMBLING AND DISASSEMBLING DEVICE Filed May 13, 1944 2 Sheets-Sheet l INVENTOR.

Dec.'18, 1945'. M. H. WILLIAMS BRAKE SHOE ASSEMBLING AND DISASSEMBLING DEVICE Filed May 13, 1944 2 Shees-Sheet 2 INVENTORJ BY A/i/cs f7 VV/Y/li/"S Patented Dec. 18, 1945 UNITED STATES" PATENT OFFICE BRAKE SHOE ASSEMBLING DISASSEMBLING DEVICE Miles H. Williams, Los Angeles, Calif. Application May 13, 1944, Serial No. 535,487

2 Claims.

This invention relates to improvements in brake shoe assembling and disassembling device and,

more particularly, devices for assembling and disassembling brake shoes such as used on modern high Speed railway cars.

A'common type of brake shoe now used on high speed trains of today, comprises, broadly, a

-' metal holder, a friction block or liner and a resilient pad or cushioninterposed between the v friction block and holder. Due to comparatively rapid wear' of the friction block in service, frequent renewal of the blocks is necessary and this may occurat different-points alongthe line where help'skilled in the assembling of such shoes is not.

available. Heretofore, the customary method of assembling these brake shoes for renewal, has

been to clamp the holder in a vise or equivalent device and'then drive the friction block, which is wedge-shaped, into position with a hammer or thelike. v

' This procedure is not only slow and inefiicient but veryfrequently results in injury to or breakage of the friction block, which is of a more or less brittle character, and fails to insure accurate po-- sitioning of the friction block with reference to 'the holder which is highly essential to efficient "functioning of the brake shoe when in service;

- One object of the present invention, therefore, is to provide a simple, relatively inexpensive device bywhich brake shoes of the type referred to, may be quickly assembled by even unskilled operators, with certain assurance that the assembly will be correct'and without danger of injury to any of the brake shoe parts during the assembling operation.

Another object of the invention is to provide a device of the character indicated which may also be employed with equal facility for removing worn friction blocks from the brake shoes.

Other objects of the invention will mor clearly appear from the description and claims hereinafter following.

In the drawings forming a part of this specification, Figure 1 is a top plan view of a device embodying one form of the invention. Figure 2' is a longitudinal, vertical section corresponding to the section line 2-2 of Figure 1. Figures 3 and 4 are transverse vertical sectional views corresponding to the section lines 3-'-3 and 4-4, respectively, of Figure 1. And Figure 5 is a perspective of the type of brake shoe with which the present invention is primarily concerned. V

In said drawings, the improved device is shown frame'is preferably of rectangular outline with side walls In and II; end walls I2 and I3; vertically offset, horizontal webs or supporting tables or platforms l4 and I5; and an intermediate, arcuate transverse partition I6, all preferably cast integral. V g

The right hand end of the device, as viewed in Figures 1 and2, is that used in assembling the shoe parts. For this operation, the arcuate partition [6 has its convex surface presented toward the right, as shown, and the supporting table or platform l5 disposed below the other table or platform M, for reasons which will appear hereinafter in connection with the description of the brake shoe assembly. The end wall I3 is provided with a threaded nut section I! withwh'ich cooperates a threaded rod [8 adapted to be readily rotated by handle l9 at its outer end. At its inner end, the rod [8 is swivelled to a pusher plate l9 which slides back and forth on the supporting table [5 as will be apparent.

Pivotally attached't'o suitable ears 20-20 on one of the side walls (I!) as shown) by pivot pin 2|, is a transversely swinging lever, 22 which, on itsunder side at a point adapted to engage approximately the center of the brake shoe friction block, carries a presser plate 23. The latter is slightly rounded on its bottom face and is movably connected to lever 22 by a short plunger 24 slidable through the lever. The 'plate' 23 is yieldingly held in extended position by spring 25 in-' terposedbetween the plate'23 and lever 22, as

shown.

The left hand end of th device, as viewed in Figures 1 and 2, is employed to disassemble the brake shoe parts. As is evident, the concave side of the central partition or abutment wall I6 is faced toward the left and the supporting table [4 is at a lesser distance below the top edge of the partition l6 than the table l5. Threaded in the nut section 26 of 'the end wall I2 is a pusher rod 21 also adapted to be actuated by a handle 28. A lever 29 with a spring influenced presser plate 30, similar to the lever 22 and presser plate 23, is pivotally connected to a side wall of the main frame, preferably the opposit wall H to that to which the lever 22 is attached. In the case of the pusher rod 21 no plate is used at its inner end for reasons that will be apparent later.

To more fully understand the mode of use of the assembling and disassembling device, a detailed description of the brake shoe assembly is necessary. The shoe, as shown, comprises a holder designated generally by the reference character B; a resilient pad or backing C and the friction block or liner D. All three elements B, C and D are longitudinally tapered or wedge shaped as evident from Figures 1 and 5.

The holder B is of generally channel shape in transverse section with a bottom wall 3| and side walls 32-32, the latter having in-turned retainer flanges 33-33 for the resilient pad C and friction block D. For attachment to the brake rigging, the holder B is provided along one side thereof with reotangularf:loops"3 t-34 and-:at'its endsiwith sets of'p'ositioning lugs"3535at the'narrowend and 36---36 at the wide end. The friction block D is formed with laterally extended flanges 31- 3! which engage under the holder flangesr33-33=to thereby retain the parts in position when properly assembled. The friction block is commonly made of a composition that is hardendmore or less brittle and preferably scored on itsvoperative face as indicated at 38.

To assemble the brake shoe, the following'procedure .isfollowed. Theholdez-Bisfirst placed on the table I5 withtheznarrow end oi 'the Ihdlder against .the partition or abutment wall .116 and is centered'by entering the two"lugs "3'5'-"3'5 in corrrespondinglyspace'd holes 1319 39 .in. said partition [6. The resilient pad "C andfriction block .D are then placed looselyin theholder Biafter which the lever 72 and,rzvresseripl'ate 23 are swung vdown to engage the top of the friction .hloc'k. 'While sufficient downward pressure is maintained on the blockD to compress the pad'Cso as .to. permit the lilock Tlanges"3l to slide easilybeneath the holder flanges 33., the pusher plate 19 is forced inwardly by turning the screw .rod f8 as willlbe evident. "This action is .continued until the pad "C andblockD are driven completely'home against the partition orabutment walllB whereuponithe lever 22 is released and the pusherplate withdrawn.

With the'improved device, as will .be evident,

"there is complete assurance of finalaccuratepositioning of the partsand all danger of breaking,

fracturing or distorting the fian ges'33 rand/or 'lugs"35fand 36 i-savoided, such as'haslheretofore been common 'with'thehammer method of assembling.

L'Io disassemble the brake shoe, the latteris 'placed'in the'oppositeiend "of the device with the wide "end against "the abutment "wall "I 6. In .this case, -duie to the higher level of the table LIA, the

"frictionblock D is at a 'level above the'top of'the wall F6, "even "when somewhat depressed by the lever 29 'and'presserpl'ate 30. "In thisproc'edure,

theimproved devicenot onlypermits assembling and disassembling of the brake shoes much -more rapidly than by the former hammer method but -addi-tionally insures accurate assembly and eliminates'danger of injury to the parts.

Although there has herein been shown and de- --scribedwhat isnow considered the preferred form of the invention, '-the same is merely illustrative and all changes and modifications are contemplated-that come within the scope of the appended claims.

What is claimed'is:

.' 1. 'In a device for assemblingubrakeshoes ofrthe .type having 'wedge shaped holder and lfriction block with aninterposed resilient pad, the .combination with a member having a horizontally disposed supporting table and an abutment wall atone endthereof ior'theshoe holder; .of apressure applying element movable lengthwiseofthe table toward said wall; and yieldable, vertically downward pressure applying means above .the table located intermediate said element. and abutment wall, saidmeans comprising a transversely extending leverlhaving adependent spring pressed plate to engage theltop of the friction block while being actuatedlby the pressure element.

'2. "In a device for assemblingand-disassembling brake shoes .of the type having wedge shaped holder and .frictionblock .withinterposedaresilient pad, the combination with a member havingttwo supporting tableslati differentvlevelsi andam intermediate abutment wall; voftwo;pressureapplying elements operative .in opposite directions dodgitu'dinally .of .and above 1 the respective stables 11.0- ward the .abutment wall; .and yieldable.,pressure applying meansdisposedtever each-pf .the tables and located intermediate thescorrespondin rpres sure applying element .and .abutment -.the level of thefhigher .ofisaidtables beingasuchlthat the "friction'block of .thelbrake .shoezis: supported 'at a level above,thetopiofetheiabutment wall.

'MILES LH. WILLIAMS. 

